Support Geth genesis file via overrides

[daniellehrner]

PR description

Fixed Issue(s)

fixes #7273

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Locally, you can run these tests to catch failures early:

• unit tests: ./gradlew build
• acceptance tests: ./gradlew acceptanceTest
• integration tests: ./gradlew integrationTest
• reference tests: ./gradlew ethereum:referenceTests:referenceTests

[github-actions]

This pr is stale because it has been open for 30 days with no activity.

[macfarla]

@daniellehrner is this useful to pick up again post holesky?

[daniellehrner]

Yes, I think so. Especially if we want to have the shared genesis config across all EL clients to avoid config issues like we have seen in Holesky.